package com.cennavi.mineplay.mineplay_data.model.transform.inter;

import com.cennavi.mineplay.mineplay_data.model.TrackPoint;
import com.cennavi.mineplay.mineplay_data.model.transform.inter.Gps;

/**
 * 各地图API坐标系统比较与转换;
 * WGS84坐标系：即地球坐标系，国际上通用的坐标系。设备一般包含芯片或者北斗芯片获取的经纬度为WGS84地理坐标系,
 * 谷歌地图采用的是WGS84地理坐标系（中国范围除外）;
 * GCJ02坐标系：即火星坐标系，是由中国国家测绘局制订的地理信息系统的坐标系统。由WGS84坐标系经加密后的坐标系。
 * 谷歌中国地图和搜搜中国地图采用的是GCJ02地理坐标系; BD09坐标系：即百度坐标系，GCJ02坐标系经加密后的坐标系;
 * 搜狗坐标系、图吧坐标系等，估计也是在GCJ02基础上加密而成的。 chenhua
 */
public class PositionUtil {
    
    public static final String BAIDU_LBS_TYPE = "bd09ll";
    
    public static double pi = 3.1415926535897932384626;
    public static double a = 6378245.0;
    public static double ee = 0.00669342162296594323;


    /**
     * WGS84 转换成 GCJ-02
     * 
     * @param lon
     * @param lat
     * @return 
     */
    public static Gps gps84_To_Gcj02(double lon, double lat) throws Exception{
        /*
    	if (outOfChina(lon, lat)) {
            return null;
        }*/
        double dLat = transformLat(lon - 105.0, lat - 35.0);
        double dLon = transformLon(lon - 105.0, lat - 35.0);
        double radLat = lat / 180.0 * pi;
        double magic = Math.sin(radLat);
        magic = 1 - ee * magic * magic;
        double sqrtMagic = Math.sqrt(magic);
        dLat = (dLat * 180.0) / ((a * (1 - ee)) / (magic * sqrtMagic) * pi);
        dLon = (dLon * 180.0) / (a / sqrtMagic * Math.cos(radLat) * pi);
        double mgLat = lat + dLat;
        double mgLon = lon + dLon;
        return new Gps(mgLon, mgLat);
    }
    
    /**
     * WGS84 转换成 百度坐标系 (BD-09)
     * 
     * @param lon
     * @param lat
     */
    public static Gps gps84_To_Bd09(double lon, double lat) throws Exception {
    	Gps gg = gps84_To_Gcj02(lon, lat);
        double x = gg.getWgLon(), y = gg.getWgLat();
        double z = Math.sqrt(x * x + y * y) + 0.00002 * Math.sin(y * pi);
        double theta = Math.atan2(y, x) + 0.000003 * Math.cos(x * pi);
        double bd_lon = z * Math.cos(theta) + 0.0065;
        double bd_lat = z * Math.sin(theta) + 0.006;
        return new Gps(bd_lon, bd_lat);
    }

    /**
     * 火星坐标系 (GCJ-02) to WGS84 
     * @param lon 
     * @param lat 
     * @return
     *
     */
    public static Gps gcj02_To_Gps84(double lon, double lat) throws Exception {
        Gps gps = transform(lon, lat);
        double lontitude = lon * 2 - gps.getWgLon();
        double latitude = lat * 2 - gps.getWgLat();
        return new Gps(lontitude, latitude);
    }

    /**
     * 火星坐标系 (GCJ-02) 转换成 百度坐标系 (BD-09)
     * 
     * @param gg_lon
     * @param gg_lat
     */
    public static Gps gcj02_To_Bd09(double gg_lon, double gg_lat) throws Exception {
        double x = gg_lon, y = gg_lat;
        double z = Math.sqrt(x * x + y * y) + 0.00002 * Math.sin(y * pi);
        double theta = Math.atan2(y, x) + 0.000003 * Math.cos(x * pi);
        double bd_lon = z * Math.cos(theta) + 0.0065;
        double bd_lat = z * Math.sin(theta) + 0.006;
        return new Gps(bd_lon, bd_lat);
    }

    /**
     * 百度坐标系(BD-09)坐标转换成GCJ-02 坐标  
     * @param bd_lon
     * @param bd_lat  
     * @return
     */
    public static Gps bd09_To_Gcj02(double bd_lon, double bd_lat) throws Exception {
        double x = bd_lon - 0.0065, y = bd_lat - 0.006;
        double z = Math.sqrt(x * x + y * y) - 0.00002 * Math.sin(y * pi);
        double theta = Math.atan2(y, x) - 0.000003 * Math.cos(x * pi);
        double gg_lon = z * Math.cos(theta);
        double gg_lat = z * Math.sin(theta);
        return new Gps(gg_lon, gg_lat);
    }

    /**
     * 百度坐标系 (BD-09)坐标转换为 WGS84坐标
     * @param bd_lon
     * @param bd_lat
     * @return
     */
    public static Gps bd09_To_Gps84(double bd_lon, double bd_lat) throws Exception {
        Gps gcj02 = PositionUtil.bd09_To_Gcj02(bd_lon, bd_lat);
        Gps map84 = PositionUtil.gcj02_To_Gps84(gcj02.getWgLon(), gcj02.getWgLat());
        return map84;
    }

    /**
     * 经纬度是否超出中国范围
     * @param lon
     * @param lat
     * @return
     */
    public static boolean outOfChina(double lon, double lat) throws Exception {
        if (lon < 72.004 || lon > 137.8347)
            return true;
        if (lat < 0.8293 || lat > 55.8271)
            return true;
        return false;
    }

    /**
     * 
     * @param lon
     * @param lat
     * @return
     */
    public static Gps transform(double lon, double lat) throws Exception {
        /*
    	if (outOfChina(lon, lat)) {
            return new Gps(lon, lat);
        }*/
        double dLat = transformLat(lon - 105.0, lat - 35.0);
        double dLon = transformLon(lon - 105.0, lat - 35.0);
        double radLat = lat / 180.0 * pi;
        double magic = Math.sin(radLat);
        magic = 1 - ee * magic * magic;
        double sqrtMagic = Math.sqrt(magic);
        dLat = (dLat * 180.0) / ((a * (1 - ee)) / (magic * sqrtMagic) * pi);
        dLon = (dLon * 180.0) / (a / sqrtMagic * Math.cos(radLat) * pi);
        double mgLat = lat + dLat;
        double mgLon = lon + dLon;
        return new Gps(mgLon, mgLat);
    }

    public static double transformLat(double x, double y) throws Exception {
        double ret = -100.0 + 2.0 * x + 3.0 * y + 0.2 * y * y + 0.1 * x * y
                + 0.2 * Math.sqrt(Math.abs(x));
        ret += (20.0 * Math.sin(6.0 * x * pi) + 20.0 * Math.sin(2.0 * x * pi)) * 2.0 / 3.0;
        ret += (20.0 * Math.sin(y * pi) + 40.0 * Math.sin(y / 3.0 * pi)) * 2.0 / 3.0;
        ret += (160.0 * Math.sin(y / 12.0 * pi) + 320 * Math.sin(y * pi / 30.0)) * 2.0 / 3.0;
        return ret;
    }

    public static double transformLon(double x, double y) throws Exception {
        double ret = 300.0 + x + 2.0 * y + 0.1 * x * x + 0.1 * x * y + 0.1
                * Math.sqrt(Math.abs(x));
        ret += (20.0 * Math.sin(6.0 * x * pi) + 20.0 * Math.sin(2.0 * x * pi)) * 2.0 / 3.0;
        ret += (20.0 * Math.sin(x * pi) + 40.0 * Math.sin(x / 3.0 * pi)) * 2.0 / 3.0;
        ret += (150.0 * Math.sin(x / 12.0 * pi) + 300.0 * Math.sin(x / 30.0
                * pi)) * 2.0 / 3.0;
        return ret;
    }
    
    /**
     * 根据角度计算方向
     * @param angle 360度的角度
     * @return
     */
    public static String getDirectionByAngle(int angle) throws Exception{
    	String din = "";
    	if(angle<23 || angle>=339){
    		din = "北";
    	}else if(angle>=23 && angle<68){
    		din = "东北";
    	}else if(angle>=68 && angle<113){
    		din = "东";
    	}else if(angle>=113 && angle<158){
    		din = "东南";
    	}else if(angle>=158 && angle<203){
    		din = "南";
    	}else if(angle>=203 && angle<248){
    		din = "西南";
    	}else if(angle>=248 && angle<293){
    		din = "西";
    	}else if(angle>=293 && angle<338){
    		din = "西北";
    	}
    	return din;
    }

//    public static void main(String[] args) {
//    	try{
//	        // 北斗芯片获取的经纬度为WGS84地理坐标 31.426896,119.496145
////	        Gps gps = new Gps(119.496145, 31.426896);
//	        TrackPoint trackPoint = new TrackPoint("", 1, 119.496145,
//	        		31.426896, 1, 1, 1L);
//	        TransformImpl transformImpl = new TransformImpl();
//	        TrackPoint Point = transformImpl.trans(trackPoint);
//	        System.out.println("gps WGS84:" + Point.getLng()+Point.getLat());
////	        Gps gcj = gps84_To_Gcj02(gps.getWgLon(), gps.getWgLat());
////	        System.out.println("gps84_To_Gcj02 :" + gcj);
////	        Gps star = gcj02_To_Gps84(gcj.getWgLon(), gcj.getWgLat());
////	        System.out.println("gcj02_To_Gps84:" + star);
////	        Gps bd = gcj02_To_Bd09(gcj.getWgLon(), gcj.getWgLat());
////	        System.out.println("gcj02_To_Bd09  :" + bd);
////	        Gps gcj2 = bd09_To_Gcj02(bd.getWgLon(), bd.getWgLat());
////	        System.out.println("bd09_To_Gcj02 :" + gcj2);
//    	}catch(Exception ex){}
//    }
}
